<!doctype html>
<html>
  <body>
    <div>
      <p>
        Count: <span id="count">0</span>
      </p>
      <button id="plus">+</button>
      <button id="minus">-</button>
    </div>
    <script src="https://unpkg.com/rxjs@5.5.2/bundles/Rx.min.js"></script>
    <script src="./counter.testable.js"></script>
  </body>
</html>

